<template>
  <div>
    <label style="display: inline-block" v-for="(item, index) in arr" :key="index">
      <input type="checkbox" v-model="newArr" :value="item"/>
      <span>{{ item }}</span>&nbsp;&nbsp;
    </label>
    <p>你选中的元素, 累加的值和为: {{ sum }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      newArr: [],
    };
  },
  methods: {},
  computed: {
    sum() {
      return this.newArr.reduce((sum, item) => sum += item, 0)
    }
  },
};
</script>

<style>
</style>